EP3267041B1 - Procédé et outil de fabrication d'une roue porteuse - Google Patents

Procédé et outil de fabrication d'une roue porteuse Download PDF

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Publication number
EP3267041B1
EP3267041B1 EP17001137.3A EP17001137A EP3267041B1 EP 3267041 B1 EP3267041 B1 EP 3267041B1 EP 17001137 A EP17001137 A EP 17001137A EP 3267041 B1 EP3267041 B1 EP 3267041B1
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EP
European Patent Office
Prior art keywords
impeller
core parts
core elements
ejectors
core
Prior art date
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Active
Application number
EP17001137.3A
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German (de)
English (en)
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EP3267041A1 (fr
Inventor
Mario Bowe
Dennis Barth
Christoph Kaiser
Thomas Warkentin
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Wilo SE
Original Assignee
Wilo SE
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Publication of EP3267041A1 publication Critical patent/EP3267041A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/44—Removing or ejecting moulded articles for undercut articles
    • B29C45/4421—Removing or ejecting moulded articles for undercut articles using expansible or collapsible cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/44—Removing or ejecting moulded articles for undercut articles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • F04D29/2227—Construction and assembly for special materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/44—Removing or ejecting moulded articles for undercut articles
    • B29C45/4407—Removing or ejecting moulded articles for undercut articles by flexible movement of undercut portions of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/748—Machines or parts thereof not otherwise provided for
    • B29L2031/7496—Pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/748—Machines or parts thereof not otherwise provided for
    • B29L2031/7498—Rotors

Definitions

  • the invention relates to a method for producing an impeller, intended in particular for a centrifugal pump, by injection molding, which has blades curved in at least two spatial directions on a support disk and between them flow channels running predominantly in the radial direction, which are each defined by at least two core parts, of which one the first core part rests in the corresponding flow channel without an undercut, and a second core part is in engagement with an undercut in the flow channel.
  • the invention relates to an injection molding tool for producing such an impeller, which is intended in particular for a centrifugal pump, by injection molding.
  • Pump impellers in particular the impellers of centrifugal pumps, typically have a plurality of blades which are arranged on a support disk in such a way that flow channels running predominantly in the radial direction are formed between the blades.
  • a cover disk is arranged on the side of the blades axially opposite the support disk, which cover disk delimits the flow channels in the axial direction.
  • a suction mouth is formed by a central opening in the cover disk, which can be lengthened by an axially extending suction neck.
  • the liquid to be pumped is sucked in through the suction mouth, deflected almost at right angles, accelerated and pumped outwards almost radially through the flow channels. If the cover disk is missing, one speaks of an open impeller.
  • Impellers are typically manufactured using injection molding processes, in which tool parts delimit the cavity to be filled with molding compound and the flow channels are defined by core parts within the cavity. After the molding compound has hardened, the core parts are removed from the flow channels.
  • the molding compound can be a plastic or an injectable metallic material.
  • the blades are often curved at least in a partial area compared to a purely radial and/or a purely axial extension. Due to this complex geometry, at least one core part inevitably has undercuts that prevent it from being easily removable from the flow channel, which makes production using the injection molding process significantly more difficult and requires complex and expensive tools.
  • European patent application EP 2 202 044 A1 a method is presented in which the cores defining the flow channels are each formed from at least two core parts lying one above the other in the axial direction, with a first core part being pulled out of the flow channel after injection molding. Subsequently, before or during the pulling out of a second core part, an additional relative movement takes place between the impeller and the second core part in a direction transverse to the target direction of the second core part. In their entirety, the second core parts are pulled out essentially radially outwards along a curved path in the longitudinal direction of the flow channel.
  • this solution means that a comparatively complex mechanical structure is necessary in order to move the large number of core parts on curved paths, and on the other hand that a comparatively long distance has to be covered due to the movement in the radial direction in order to close the impeller demold. Since there are limits to the movement speeds, the demolding process takes a correspondingly long time.
  • the US 3,837,612A discloses an injection molding tool for producing impellers with curved blades and flow channels running between them, each of which is defined by two core parts, a first core part lying in the flow channel without undercuts and a second core part engaging with undercuts in the flow channels. To free the impeller, an axial relative movement is carried out between the first and the second core part. From the US 3,837,612A however, it is not clear how the impeller is subsequently demolded from the second core part.
  • JP 2008 303740A discloses axially displaceable core parts for the production of impellers, the provision of a rod element on the impeller, by means of which the impeller is demolded from the core parts.
  • the object of the invention is to overcome the disadvantages mentioned and to provide a method and a device for producing an impeller with curved blades in which as few core parts as possible have to be moved and the core parts can be moved easily over the shortest possible travel distances.
  • the method according to the invention for producing a pump impeller, in particular for an impeller of a centrifugal pump, is characterized in that Ejectors push the injection-molded impeller away from the second core parts in the axial direction during the second relative movement.
  • the impeller is injection molded in a manner known per se, in that a cavity delimited by tool parts and the cores, which defines the shape, position and curvature of the blades and the support disk, is filled with a molding compound.
  • the impeller is then demolded according to the invention by a first, linear-axial relative movement and a second, axial-rotary relative movement. From the impeller's point of view, the first relative movement initially moves the first core parts out of the flow channel, which are not in engagement with the blades in the axial direction by undercuts. The impeller can be pushed or pulled axially.
  • the axial direction refers here to the direction of the impeller axis or a direction parallel thereto.
  • the first relative movement leads to a free space being created in the flow channels between the blades and the second core parts, which is used in the second relative movement.
  • the impeller is moved away from the second core parts in the axial direction by the second relative movement, with the blades sliding along the second core parts while performing a rotary movement into the previously free spaces.
  • the impeller can be pushed or pulled axially, with pushing being preferred since the rotational movement then takes place automatically and does not have to be controlled or coordinated.
  • the movement of the blades into the free spaces of the flow channels means that the second core parts no longer have an undercut in relation to the blades and the impeller is therefore completely demoulded with respect to the core parts.
  • a guiding of core parts along curved paths is avoided by the first linear-axial relative movement and by the second rotary-axial relative movement. Rather, the movement of the core parts is only linear, which means that the injection molding tool is mechanically simpler and cheaper, in particular with regard to the drive or drives, and also allows less maintenance and longer service lives. Furthermore, a compact design of the injection molding tool can be achieved by moving the core parts on axial paths. This enables multi-cavity molds to be set up in a confined space.
  • the second core parts can push the injection-molded impeller away from the first core parts in the axial direction. From the point of view of the impeller, the first core parts are thus removed from the respective flow channel by a movement of the second core parts.
  • the first core parts can be stationary. This offers the advantage that only the second core parts have to be driven, with the impeller also moving. The number of moving components is thus reduced.
  • the injection-molded impeller is pushed away from the second core parts in the axial direction by means of ejectors.
  • the second core parts now also remain stationary, with only the ejectors moving in the axial direction relative to both the second and the first core parts. This allows the impeller to rotate relative to the second cores.
  • the blades slide on the second core parts.
  • the pushing away of the impeller by the ejectors has the advantage that the undercuts can be overcome solely because of the actively caused axial movement, with the rotary movement of the impeller required for demoulding taking place automatically.
  • the rotational movement is consequently forced by the compressive force acting axially.
  • the ejectors can have an end face which is flush with the surface of the second core parts and thus also delimits the cavity. The result of this is that after the impeller has been injection molded, this end face presses against the support disk during the second relative movement in order to move it away from the second core parts.
  • the free space between the blades and the first core parts is already created by a short axial movement between the impeller and the first core parts, it is not necessary to wait before the start of the second relative movement until the impeller is completely axially in front of the first core parts during the first relative movement . Rather, the second relative movement can already begin during the first relative movement, in particular shortly after the first relative movement. This means that the second core parts and the ejectors can move simultaneously, at least temporarily. Since the movements are ideally decoupled from each other, i.e. are independent, the second core parts and the ejectors can be driven at the same or different speeds. Carrying out the relative movements at least partially simultaneously has the advantage that the impeller is removed from the mold more quickly, thereby shortening the production process of the impeller.
  • the ejectors can be rod-shaped. In one embodiment variant, the ejectors can be guided axially within the second core parts. This means that the ejectors only during or for the second relative movement have to emerge from the second core parts, ie remain within the second core parts during the first relative movement.
  • the circumferential division of a core lying in a flow channel into a stationary first and a moving second core part according to the present invention may not allow the ejectors to be guided in the second core parts.
  • the ejectors can be guided axially within the first core parts.
  • Both open and covered impellers can be produced with the method according to the invention.
  • a separately produced, in particular injection-molded, cover disc can be fastened to the top edges of the blades of the demolded impeller. This can be done, for example, by gluing or by means of ultrasonic welding.
  • the upper edge of the blades can preferably have a material projection which can lie in a corresponding, elongated depression in the underside of the cover disk facing the support disk. This achieves a positive fit that facilitates a centered alignment of the cover disk relative to the support disk for subsequent attachment and prevents the cover disk from slipping on the blades.
  • the material projection has a special technical effect for ultrasonic welding, since it can melt as a result of the local heating and thus form a material connection between the blades and the cover disk. In this way, a permanent, firm connection can be achieved between the cover plate and the blades, without the flow path being adversely affected by any adhesive residues.
  • An injection molding tool according to the invention for producing a pump impeller, in particular for an impeller of a centrifugal pump, by injection molding is characterized in that the first and the second core part of each flow channel are arranged one behind the other in the circumferential direction and can be moved in the axial direction relative to one another, the injection molding tool being used to demould the injection-molded impeller is set up to first carry out a linear-axial relative movement between the first core parts and the impeller in order to move the first core parts out of the flow channels, and then to move the impeller away from the second core parts by means of a second relative movement in the axial direction while performing a rotary movement .
  • ejectors move the impeller away from the second core parts.
  • the injection molding tool according to the invention has these ejectors in a corresponding manner.
  • the injection molding tool according to the invention is thus set up to carry out the method according to the invention. It thus achieves demolding of the injection-molded impeller exclusively through axial relative movements of the core parts.
  • the travel distance that the core parts have to cover for demoulding is reduced compared to the prior art, so that the impeller can be demolded more quickly. Due to the purely linear moving parts, the implementation and maintenance of the injection molding tool and its drive is easier than with a radial guide, in particular curved guide of the core parts.
  • a plastic for example a thermoplastic or duroplastic, or an injectable metallic material is preferably used as the molding compound in order to injection mold the impeller.
  • a particularly compact design of the injection mold can be achieved in that the first core parts are designed in one piece with a stationary guide block of the injection mold, in which the second core parts are guided so that they can move axially between the first core parts.
  • the guide block forms a unit that can be removed for maintenance purposes in the injection molding tool.
  • the first cores therefore do not have to be used individually.
  • the first core parts can be produced individually and then assembled to form or with the guide block to form a unit.
  • the first core parts can preferably also be made in one piece and form the guide block in the form of a solid block. This eliminates the assembly effort.
  • a one-piece guide block offers the advantage that channels can be drawn through it, through which a liquid for temperature control of the guide block can be conveyed, without measures for sealing channel transitions between the first core parts being necessary.
  • the guide block has recesses which correspond in shape and size to the second core parts and in which the second core parts are held in a form-fitting, axially sliding manner.
  • the guide block is thus used for axial guidance of the second core parts, so that they cannot move transversely to the impeller axis.
  • the temperature of the second core parts can also be controlled indirectly by the guide block.
  • the guide block can preferably be designed in such a way that the first core parts each merge at their radially inner end into a common ring at least partially defining a rotor hub. This mechanically stabilizes the radially inner ends of the first core parts and thus increases the stability of the entire guide block.
  • the first core part and the second core part of each flow channel can have a contact surface that extends axially parallel to the impeller axis.
  • the first and second core parts abut one another at this contact surface. Due to this axially parallel orientation of the contact surface, the front side of the first core part has no undercut in relation to the rear side of the second core part, so that a linear-axial relative movement is possible.
  • these can be guided so as to be axially movable in the second core parts in order to be able to exert an axial force on the impeller, more precisely on the support disk, during the second relative movement in the axial direction away from the second core parts, by which the impeller moves in the axial direction pushed away from the second core parts.
  • the ejectors can in each case terminate at an impeller-side end with their end face flush with the respective second core part in order to be in contact with the support disk of the impeller. During the second relative movement, the end faces then emerge from the second core parts and push the impeller away from the second core parts.
  • the ejectors can be guided so as to be axially movable in the first core parts.
  • the number of ejectors may correspond to the number of second core parts.
  • the ejectors can be arranged symmetrically, distributed equidistantly over the circumference.
  • the impeller may have significantly more, e.g. 7, 8, 9, 10, 11, 12 or 13 blades and a corresponding number of first and second core parts.
  • the ejectors can form a first, outer ring-shaped arrangement, in which case a second, inner ring-shaped arrangement of ejectors can also be present.
  • inner ejectors which lie on a ring which is arranged within the first arrangement, in particular concentrically thereto. Due to the inner and outer arrangement of the ejectors, a uniform distribution of force can be exerted on the support disk of the impeller when the ejectors move axially relative to the core parts, and this can thus be pushed away uniformly from the core parts. This reduces stress on the injection molded impeller during ejection and prevents deformation and/or damage to the impeller. Furthermore, the dimensional accuracy is guaranteed.
  • the inner and the outer ejectors are suitably movable or moved synchronously.
  • the inner ejectors can be guided axially in the second core parts.
  • the inner ejectors can be guided axially in the first core parts.
  • the inner ejectors can be held in the radially inner ends of the first core parts or preferably within the ring into which the first core parts merge.
  • All second core parts can preferably be fastened on or to a common linearly displaceable base plate. All second core parts can thus be moved synchronously by a linear displacement of this base plate, so that the impeller is circumferentially evenly removed from the first core parts.
  • the second core parts therefore do not have to be actively moved or driven individually. Rather, only the base plate has to be moved accordingly for its axial movement.
  • the base plate can, for example, hydraulically, pneumatically or be moved or driven electromechanically, for example by means of a servomotor.
  • the ejectors can be attached to or on a common, linearly displaceable ejector plate. By linearly displacing this ejector plate, all ejectors connected to it can be moved synchronously, so that the impeller is removed uniformly from the second core parts. The ejectors therefore do not have to be actively moved or driven individually. Rather, only the ejector plate has to be moved accordingly for its axial movement.
  • the ejector plate can also be moved or driven, for example, hydraulically, pneumatically or electromechanically, for example by means of a servomotor.
  • a first, in particular an outer ejector plate can be present on or to which all the outer ejectors are attached
  • a second, in particular an inner ejector plate can be present on or to which all the inner ejectors are attached.
  • the inner and the outer ejector plate can be moved independently of one another, a synchronous movement and thus a common drive of both ejector plates makes sense for the purpose of a uniform application of force to the impeller. It is structurally simple if all ejectors are arranged on or on a common ejector plate, i.e. both the outer ejectors and the inner ejectors. It is therefore not necessary to provide two drives to be synchronized.
  • a particularly compact embodiment of the injection mold is achieved when the base plate is arranged between the guide block and the ejector plate and the ejectors are guided in the base plate.
  • a distance is provided between the base plate and the guide block in order to move the base plate, if necessary together with the ejector plate, in particular synchronously with this, in order to carry out the first relative movement in the direction of the guide block.
  • the second core parts are axially extended relative to the first core parts, or moved in the direction of the impeller.
  • the ejector plate and the base plate in the initial state immediately after Injection molding of the impeller may be provided a distance to move the ejector plate to carry out the second relative movement in the direction of the base plate.
  • the ejectors are extended axially relative to the second core parts, or moved in the direction of the impeller.
  • the respective distance is then correspondingly reduced by the movement, although the distance existing between them is kept constant by a synchronous movement between the base plate and the ejector plate during the first relative movement.
  • the guide block can preferably rest on a further plate, with both the guide block and the further plate having axial openings which are aligned with one another and through which the second core parts and the ejectors extend.
  • the arrangement according to the invention of the base plate, the guide block together with the first core parts, the second core parts and the ejector plate enables a compact, robust and easy-to-implement embodiment of the injection molding tool according to the invention.
  • Only two drive units are therefore necessary for the demolding of the injection-molded impeller, which specify the axial position of the base plate of the second core parts and the ejector plate.
  • These can preferably be pneumatic, hydraulic or electromechanical drives.
  • a mold insert 20 for a first injection molding tool 19 is shown in perspective figures 2 , 5a , 6a and 7a is shown in more detail in cut parts and the production of an impeller 1 is used for a centrifugal pump, as in the Figures 10a and 11 is shown.
  • the impeller 1 can have an in Figure 10b have shown cover plate 4, which is attached to the upper edges 14 of the blade.
  • the impeller is preferably made of plastic, which is introduced into a cavity formed in the mold insert 20 in the form of an injectable molding compound.
  • the impeller 1 produced has a support disk 3 on which several, for example seven, blades 2 are integrally formed. Between the blades 2 there are flow channels 5 for conveying a liquid from a central area of the impeller 1 essentially radially outwards.
  • Each blade 2 has a radially inner blade end 7 and a radially outer blade end 6, arcuately extending from the inner blade end 7 to the radially outer blade end.
  • the blades are thus curved in the radial direction.
  • they have an employment in the axial direction, which increases towards the inner end 7 of the blade.
  • Each blade 2 is increasingly tilted relative to an axial plane as it gets closer to the impeller axis 45, so that the blades 2 extend at their radially outer end 6 in the axial direction approximately within the axial plane.
  • each blade 2 therefore has a blade front side 13 and a blade rear side 12.
  • the impeller 1 also has a hub 8 made of a metal ring, on which the impeller 1 is mounted in the installed state in the centrifugal pump.
  • An opening 9 is provided in the hub 8 to accommodate a shaft of the centrifugal pump and thus transmit torque to the impeller 1.
  • the mold insert 20 has first and second core parts 22, 23 which form the flow channels 5 of the impeller 1 to be produced, the first core parts 22 and the second core parts 23 lying one behind the other in the circumferential direction.
  • the second core parts 23 are in FIG 1 compared to the first core parts 22 axially slightly.
  • Each core part 22, 23 extends essentially in an arc along the entire flow channel 5, so that there is no further subdivision of the cores in the radial direction. Nevertheless, such a subdivision could well be possible.
  • the first core pieces 22 are all formed integrally with each other and with a stationary guide block 21 connecting the radially outer ends of the first core pieces 22 to each other.
  • the radially inner ends of the first core parts 22 connect to form a ring 44, which is also part of the guide block 21.
  • the guide block 21 is a stationary part of the injection molding tool 19 and is traversed here by channels, for example, in order to conduct a temperature control medium and/or compressed air to the core parts 22 , 23 .
  • the first and second core parts 22, 23 can be moved linearly and axially relative to one another in order to demould the injection-molded impeller.
  • the second core parts 23 are guided so as to be axially movable in the guide block 21 or between the first core parts 22 .
  • the axial length of the second core parts 23 is greater, in particular 2 to 3 times the axial length of the first core parts 22.
  • a drive that moves the second core parts 23 axially is in 1 Not shown.
  • each first core part 22 of a flow channel 5 and the second core part 23 of the adjacent next flow channel 5 is a blade cavity 37 to form a corresponding blade 2 of the impeller 1 available.
  • the blade cavity 37 is designed in such a way that the pitch of the blade 2 in relation to the support disk 3 increases as the proximity to the impeller axis 45 increases.
  • the radially inner area 7 of the blades 2 is undercut by the second core parts 23, ie a part of the second core parts 23 in the plan view according to FIG 3 above the blades 2 or between the blade 2 and support disk 3, so that the second core parts 23 cannot easily be removed from the mold axially.
  • the first core parts 22 are free of undercuts with the impeller blades 2 so that they can be moved freely out of the flow channels 5 or allow a relative movement between them and the impeller 1 .
  • the first and second core parts 22, 23 also have a front side 30, 33 and a back side 29, 32 corresponding to the blades 2, respectively.
  • the front side 33 of the second core part 23 is in contact with the rear side 29 of the first core part 23 .
  • the front side 30 of the first core part 22 defines the rear side 12 of the blade 2 to be formed and the rear side 32 of the second core part 23 defines the front side 13 of the blade 2 to be formed.
  • the first embodiment also has inner ejectors 25 which also form an annular array concentric with the outer annular array. how to get in 1 can see, the inner ejectors 25 are moved by the same distance as the outer ejectors 24 or the second core parts 23 in relation to the first core parts 22 out of the guide block 21 . The inner ejectors 25 are guided inside the guide block 21 . she serve to exert an axial force on the radially inner region of the support disk 3 of the impeller 1 during demolding.
  • the second core parts 23 have projections 41 on their radially outer areas in the tangential direction, which can be accommodated by corresponding depressions 42 in the guide block 21 at the radial end of the first core parts 22 .
  • the indentations 42 form shoulders which form stops for the projections 41 when the second core parts 23 are retracted. This ensures that the end faces 35 of the second core parts 23 form a flush surface almost seamlessly in the retracted state.
  • FIG. 2 shows the cross section of a partial section of the injection molding tool 19, with the second core parts 23, the outer ejectors 24 and the inner ejectors 25 being retracted.
  • the impeller 1 is already injection molded, ie the blade cavity 37 and the support disk cavity 31 are filled with the molding compound. This is the initial state before impeller 1 was removed from the mold.
  • the guide block 21 rests on a stationary plate 27 which has openings in which the second core parts 23 and the ejectors 24, 25 are axially guided. All second core parts 23 are fastened to a linearly displaceable base plate 28 , in particular screwed by means of screws 46 .
  • a linearly displaceable base plate 28 in particular screwed by means of screws 46 .
  • axial openings are provided in the base plate 28, through which the ejectors 24, 25 extend, which in turn are fastened to a common ejector plate 26.
  • This ejector plate 26 can be moved separately or together with the base plate 28 .
  • the base plate 28 is thus located between the guide block 21 and the ejector plate 26, with a distance between them in each case being present in the initial state.
  • the base plate 28 and the ejector plate 26 are driven to move linearly in the axial direction, for example hydraulically.
  • the distance between the plate 27 and the base plate 28 and the distance between the base plate 28 and the ejector plate 26 is selected in the illustrated state so that the end faces 34 of the first core parts 22, the end faces 35 of the second core parts 23 and the Faces 36, 40 of the inner and outer ejectors 24, 25 form a smooth surface.
  • the molding compound for producing the impeller 1 is already in the support disk cavity 31 and in the blade cavities 37.
  • the blade cavities 37 can have recesses 38 on their side facing away from the support disk 3, which form material projections 15 on the blade upper edges 14 of the impeller 1, see Figure 10a .
  • a bolt 43 is arranged in the center of the injection molding tool 19 and holds the metal ring forming the hub 8 .
  • the metal ring is thus an insert that is placed in the injection mold before injection molding.
  • the hub 8 does not necessarily have to be formed from a metal insert. Rather, it can also be injection molded in one piece with the support disk 3 from plastic.
  • the injection molding tool 19 On the axial side opposite the guide block 21 , the injection molding tool 19 has an essentially plate-shaped tool part (not shown in the figures), which delimits the support disk cavity 31 on the side facing away from the core parts 22 , 23 .
  • This tool part is removable, preferably also axially movable, so that it can be removed from the impeller before demolding it.
  • the molding compound is poured into the blade cavities 37 and the carrier disk cavity 31, with the geometry of the blades 2 being defined by the blade cavities 37 and the side of the carrier disk 3 carrying the blades 2 essentially being defined by the end faces 34, 35 of the first and second core parts 22, 23 is determined.
  • the outer and inner ejectors 24, 25 are each distributed in a ring shape in such a way that their end faces 36, 40 apply force evenly to the underside of the support disk 3 when it is extended.
  • Figure 4a a transverse section along section line XX in 3 shown purely schematically.
  • the front sides 30 of the first core parts 22 and the back sides 32 of the second core parts 23 form the blade cavities 37 in the spaces between them and in this way define the geometry of the blades 2 of the impeller 1.
  • the geometry of the support disk 3 is defined by the end faces 34 of the first core parts 22 and by the end faces 35 of the second core parts 23 .
  • a first and a second core part 22, 23 lie against one another, each forming a contact surface which is formed by the front side 33 of the second core part 23 and by the rear side 29 of the first core part 22 .
  • the rear sides 29 of the first core parts 22 and the front sides 33 of the second core parts 23 are oriented parallel to the axis of the impeller 45 and are in full contact, so that the molding compound cannot penetrate into the gaps.
  • FIG. 13 is a cross section along the YY line 3 shown schematically, in addition to 3 and in addition to Figure 4a now the impeller 1 is shown with its support disc 3.
  • the outer ejectors 24 are visible in this representation, only one such ejector 24 being visible here.
  • the end faces 36 of the second core parts 23 are in contact with the support disk 3 .
  • the second core parts 23 each undercut a blade 2, so that these core parts 23 cannot initially be removed from the mold axially.
  • the blades 2 are not engaged with undercuts of the first core parts 22 .
  • a first relative movement A is now carried out in the axial direction between the first and second core parts 22, 23 by the second core parts 23 being moved linearly and axially away from the first core parts 22 together with the impeller 1.
  • An intermediate or final state of this first relative movement is in Figures 5a and 5b shown.
  • the support disk 3 of the impeller 1 rests on the end faces 35 of the second core parts 23, the end faces 36 of the outer ejectors 24 and the end faces 40 of the inner ejectors 25.
  • the impeller 1 is pushed away from the second core parts 23 by a second axial relative movement B, during which it performs a forced rotary movement C.
  • a state of the injection molding plant 19 shortly after the start of the second relative movement is in FIG Figures 6a and 6b shown.
  • the synchronously moving inner and outer ejectors 24 and 25 exert a force in the axial direction on the support disk 3, with the outer ejectors 24 moving out of the second core parts 23, so that the support disk 3 of the impeller 1 only presses on the Faces 36 of the outer ejector 24 and the inner ejector 25 rests.
  • the axial force exerted on the support disk 3 by the extension of the ejectors 24, 25 first overcomes the static friction between the blade front sides 13 and the rear sides 32 of the second core parts 23, with the blades 2 then moving along the rear sides 32 of the second core parts 23 and the support disk 3 slides along the end faces 36 of the outer ejectors 24 and the end faces 40 of the inner ejectors 25 and thereby executes the rotary movement C.
  • the blades 2 increasingly disengage from the undercuts until the impeller 1 is completely free of the undercut.
  • the second relative axial movement B is already carried out during the first relative movement A.
  • the time required to demould the injection-molded impeller 1 can be reduced, since even a partial implementation of the first axial relative movement A is sufficient to create a free space between the rear side of the blade 12 and the first core parts 22 in order to accommodate the undercuts of the front side of the blade 13 to overcome.
  • FIGS 7a and 7b show the end state, in which the ejectors 24 and 25 are fully extended and the undercuts opposite the blade front sides 13 are completely overcome.
  • the injection-molded impeller 1 is thus complete removed from the mold and can be fed to subsequent process steps either manually or automatically.
  • FIG. 8 is a second embodiment of a mold insert 20 'of the injection mold 19 is shown in perspective, this embodiment is intended for wheels that compared to the wheels of the embodiment of the Figures 1 to 7b have a smaller diameter.
  • this second embodiment variant only outer ejectors 24 are present, which are also guided in an axially movable manner by the first core parts 22 and are thus surrounded by them.
  • the movement sequences are analogous to the first embodiment variant.
  • a first linear-axial relative movement A is thus carried out, in which the second core parts 23, preferably together with the ejector 24, are moved away from the first core parts 22 and the impeller 1 is also moved away from the first core parts 22.
  • a second axial relative movement B is then carried out, in which the ejectors 24 are moved beyond the axial extent of the second core parts 23 .
  • the impeller 1 performs the rotary movement already described.
  • An injection mold 19, the second mold insert 20 ' 8 has is in Figure 9a shown as a partial cross section.
  • the end faces 34 of the first core parts 22, the end faces 35 of the second core parts 23 and the end faces 36 of the ejectors 24 form a smooth surface which defines the inner axial end face of the support disk 3.
  • the impeller 1 After the impeller 1 has been removed from the injection molding tool 19, it has the Figure 10a shown open form.
  • the finished impeller 1 is in 11 shown.
  • the cover disk 4 has a suction mouth 10 which is extended in the axial direction by a suction neck 11 .
  • the liquid to be pumped is typically sucked in through the suction mouth 10 and guided through the flow channels 5 from the inner blade end 7 to the outer blade end 6 .
  • the upper blade edges 14 can have at least partial material projections 15 in the longitudinal direction of the blades 2, which are received by corresponding grooves (not shown) on the underside of the cover disk 4 facing the support disk 3.
  • An ultrasonic welding process is preferably used to connect the cover disk 4 to the blade upper edges 14, which ensures a permanent material connection and advantageously does not cause any adhesive residues.
  • the method according to the invention and the injection molding tool that executes it offer the possibility of producing an impeller, in particular the impeller of a centrifugal pump, which has blades curved in at least two spatial directions, in a simple manner and of achieving shortened travel paths by demoulding the impeller in the axial direction and thus the reduce production times.
  • an impeller in particular the impeller of a centrifugal pump, which has blades curved in at least two spatial directions, in a simple manner and of achieving shortened travel paths by demoulding the impeller in the axial direction and thus the reduce production times.
  • a compact design of the injection mold is made possible due to the few components that can only be moved linearly, requires little maintenance and enables a compact design.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (14)

  1. Procédé de fabrication d'un rotor de pompe (1), en particulier pour un rotor de pompe centrifuge, par moulage par injection, présentant sur un disque porteur (3) des aubes (2) courbées dans au moins deux directions spatiales entre lesquelles s'étendent, principalement dans la direction radiale, des canaux d'écoulement (5) définis chacun par au moins deux parties de noyau (22, 23), une première partie de noyau (22) étant insérée sans échancrure dans le canal d'écoulement (5) correspondant et une seconde partie de noyau (23) est en prise avec échancrure dans le canal d'écoulement (5), sachant que la première et la seconde partie de noyau (22, 23) de chaque canal d'écoulement (5) sont disposées l'une derrière l'autre dans la direction circonférentielle, et que le démoulage du rotor (1) moulé par injection, requiert d'abord un premier mouvement relatif linéaire-axial entre les premières parties de noyau (22) et le rotor (1), le rotor (1) étant ensuite éloigné des secondes parties de noyau (23) par un second mouvement relatif dans la direction axiale en effectuant un mouvement de rotation, caractérisé en ce que des éjecteurs (24, 25) repoussent le rotor (1) moulé par injection dans la direction axiale lors du second mouvement relatif des secondes parties de noyau (23).
  2. Procédé selon la revendication 1, caractérisé en ce que, lors du premier mouvement relatif, les secondes parties de noyau (23) repoussent le rotor moulé par injection (1) des premières parties de noyau (22) en direction axiale.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que le second mouvement relatif commence pendant le premier mouvement relatif.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que les éjecteurs sont guidés axialement à l'intérieur des secondes parties de noyau (23).
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'un disque de couverture (4) fabriqué séparément est fixé sur les bords supérieurs (14) des auges (2) du rotor (1) démoulé.
  6. Outil de moulage par injection (19) de fabrication d'un rotor de pompe (1), en particulier pour un rotor de pompe centrifuge, par moulage par injection, présentant sur un disque porteur (3) des aubes (2) courbées dans au moins deux directions spatiales entre lesquelles s'étendent, principalement dans la direction radiale, des canaux d'écoulement (5), sachant que l'outil de moulage par injection comprend deux parties de noyau (22, 23), sachant que les canaux d'écoulement (5) sont au moins définis chacun par au moins deux parties de noyau (22, 23), une première partie de noyau (22) étant insérée sans échancrure dans le canal d'écoulement (5) correspondant et une seconde partie de noyau (23) est en prise avec échancrure dans le canal d'écoulement (5), sachant que la première et la seconde partie de noyau (22, 23) de chaque canal d'écoulement (5) sont disposées l'une derrière l'autre dans la direction circonférentielle et mobiles l'une par rapport à l'autre dans la direction axiale, sachant que l'outil de moulage par injection (19) est conçu, pour le démoulage du rotor (1) moulé par injection, pour effectuer d'abord un premier mouvement relatif linéaire-axial entre les premières parties de noyau (22) et le rotor (1) pour déplacer les premières parties de noyau (22) hors des canaux d'écoulement (5), et ensuite à éloigner le rotor (1) des secondes parties de noyau (23) par un second mouvement relatif dans la direction axiale en exécutant un mouvement de rotation, caractérisé en ce que l'outil de moulage par injection (19) présente des éjecteurs (24, 25) mobiles axialement pour pouvoir éloigner le rotor (1) des secondes parties de noyau (23) lors du second mouvement relatif.
  7. Outil de moulage (19) selon la revendication 6, caractérisé en ce que les premières parties de noyau (22) sont formés d'une seule pièce avec un bloc de guidage fixe (21), dans lequel les secondes parties de noyau (23) sont guidées pour se déplacer axialement entre les premières parties de noyau (22).
  8. Outil de moulage (19) selon la revendication 6 ou 7, caractérisé en ce que les premières parties de noyau (22) se deviennent, à leurs extrémités situées radialement à l'intérieur, un anneau (44) définissant au moins partiellement un moyeu de rotor (8).
  9. Outil de moulage (19) selon la revendication 6, 7 ou 8, caractérisé en ce que la première partie de noyau (22) et la seconde partie de noyau (23) de chaque canal d'écoulement (5) présentent une surface de contact orientée parallèlement à l'axe du rotor (45).
  10. Outil de moulage (19) selon l'une des revendications 6 à 9, caractérisé en ce que les éjecteurs (24) sont guidés axialement de manière mobile dans les secondes parties de noyau (23).
  11. Outil de moulage (19) selon l'une des revendications 6 à 10, caractérisé en ce que les éjecteurs (24) forment un premier agencement annulaire extérieur et en ce qu'un second agencement annulaire d'éjecteurs intérieurs (25) est guidé de manière mobile dans les premières parties de noyau (22), en particulier aux extrémités radialement intérieures des premières parties de noyau (22).
  12. Outil de moulage (19) selon l'une des revendications 6 à 11, caractérisé en ce que les secondes parties de noyau (23) sont fixées sur ou à une plaque de base commune (28) à déplacement linéaire.
  13. Outil de moulage (19) selon l'une des revendications 6 à 12, caractérisé en ce que les éjecteurs (24, 25) sont fixés sur ou à une plaque d'éjecteurs commune (26) à déplacement linéaire.
  14. Outil de moulage (19) selon la revendication 13, caractérisé en ce que la plaque de base (28) est placée entre le bloc de guidage (21) et la plaque d'éjecteurs (26) et les éjecteurs (24, 25) sont guidés dans la plaque de base (28).
EP17001137.3A 2016-07-06 2017-07-04 Procédé et outil de fabrication d'une roue porteuse Active EP3267041B1 (fr)

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DE102016008127.9A DE102016008127A1 (de) 2016-07-06 2016-07-06 Verfahren und Werkzeug zur Herstellung eines Laufrades

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CN113799340B (zh) * 2021-08-24 2023-07-28 安徽凯特泵业有限公司 高效叶轮的进液段成型模具
CN113799329B (zh) * 2021-08-24 2023-07-28 安徽凯特泵业有限公司 高效叶轮的出液段成型模具
CN114571673B (zh) * 2022-03-03 2023-10-13 济南科德智能科技有限公司 一种弯头管件衬塑模具

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JPH0716884A (ja) * 1993-06-30 1995-01-20 Toshiba Chem Corp 樹脂製ファン及びその一体成形方法並びにその成形用金型
JP2812198B2 (ja) * 1994-04-28 1998-10-22 豊田合成株式会社 ステアリングホイール用パッドの製造方法
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JP5303120B2 (ja) * 2007-06-05 2013-10-02 株式会社川本製作所 インペラ
EP2202044B2 (fr) 2008-12-24 2014-05-07 Grundfos Management A/S Procédé destiné au moulage par injection d'une roue de pompe centrifuge
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US20120104654A1 (en) * 2010-10-29 2012-05-03 Aisin Seiki Kabushki Kaisha Molding method and molding device for forming impeller

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